MQ-5 Gas Sensor is a semiconductor sensor used to detect flammable gases such as LPG, methane, and natural gas. It is widely used in gas leakage detection systems and Arduino/IoT projects.
Sensor Type:Semiconductor (SnO₂ sensitive layer)
Target Gases:LPG, Methane (CH₄), Natural Gas, Coal Gas, Propane, Iso-butane
Detection Range:200 ppm – 10,000 ppm
Operating Voltage (Vc):5 V ±0.1 V
Heater Voltage (Vh):5 V ±0.1 V
Heater Resistance (Rh):≈31 Ω ±10% at room temperature
Heater Power Consumption:≤ 800 mW
Load Resistance (RL):Typically 20 kΩ (adjustable)
Output Signal:Analog voltage (sometimes digital threshold on modules)
Preheat Time:≥ 24 hours for stable readings
Operating Temperature:−10 °C to 50 °C
Storage Temperature:−20 °C to 70 °C
Humidity Range:≤ 95% RH
Sensing Resistance (Rs):~10 kΩ – 60 kΩ (depending on gas concentration)(Makerlab PH)